(a) Load is applied to the three-hinged trussed arch in Figure P12.40 through the upper chord…
(a) Load is applied to the three-hinged trussed arch in Figure P12.40 through the upper chord panel points by a floor beam and stringer floor system. Draw the influence lines for the horizontal and vertical reactions at support A and the forces or components of force in members BC, CM, and ML. (b) Assuming that the dead load of the arch and floor system can be represented by a uniform load of 4.8 kips/ft, determine the forces in bars CM and ML produced by the dead load. (c) If the live load is represented by a uniformly distributed load of 0.8 kip/ft of variable length and a concentrated load of 20 kips, determine the maximum force in bar CM produced by the live load. Consider both tension and compression. Joint E acts as a hinge.
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